package day07;

import java.util.Random;

public class VerificationCode {
    public static void main(String[] args) {
        String code = generateVeriCode(6);
        System.out.println("验证码:"+code);
    }

    /** 生成验证码 */
    public static String generateVeriCode(int len){
        String code = "";
        char[] chs = {'a','b','c','d','e','f','g','h','i','j','k','l','m','n',
                'o','p','q', 'r','s','t','u','v','w','x','y','z','A','B','C',
                'D','E','F','G','H','I','J','K','L','M','N','O','P','Q','R','S',
                'T','U','V','W','X','Y','Z','0','1','2','3','4','5','6','7','8','9'};
        Random rand = new Random();
        for (int i=1;i<=len;i++){
            //int index = (int)(Math.random()*chs.length); //随机下标
            int index = rand.nextInt(chs.length);
            code += chs[index]; //获取随机字符并拼接到code中
        }
        return code;
    }
}
